Method for heating up of a ceramic glow plug and glow plug control unit

Active Publication Date: 2009-01-08
BERU AG DE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010]The surprisingly positive effect of the method according to the invention on the service life of ceramic glow plugs may be attributed to the fact that local current paths are generated in the ceramic conductor of a ceramic glow plug which, when applying an excessive voltage, might perhaps lead to a local overheating and thus to a damage of the glow plugs. Caused by the temperature, the electric resistance increases during the heating-up process so that, in order to heat up to a desired operating temperature as rapidly as po

Problems solved by technology

In order to start an engine, the glow plugs must be heated up as promptly as possible to a typical operating temperature of 1000° C. to 1300° C. If during the heating up process the operating temperature is overs

Method used

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  • Method for heating up of a ceramic glow plug and glow plug control unit
  • Method for heating up of a ceramic glow plug and glow plug control unit
  • Method for heating up of a ceramic glow plug and glow plug control unit

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Embodiment Construction

[0020]FIG. 1 shows the course of the effective voltage Ueff in volts over time t in seconds. The voltage is applied to a ceramic glow plug to heat it up to an operating temperature for starting of a motor. At the onset of a heating-up process the effective voltage is applied as a starting voltage which is smaller than the voltage of the vehicle's electrical system, which is today usually about 12V. The starting voltage, which is larger than zero, is chosen as a base value and preferably reached in a jump.

[0021]Thereby a method is realized for heating-up of a ceramic glow plug to an operating temperature for the starting of a motor. During the method a variable voltage is applied to the glow plug. Starting from a base value the voltage increases superproportional to the elapsed heating-up time until a maximum value is reached.

[0022]In FIG. 1 it is shown that the effective voltage Ueff increases in a parabolic manner from a base value of 6 volts to a maximum value of about 11 volts. T...

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Abstract

Herein is described a method for the heating-up of a ceramic glow plug by applying a variable electric voltage to the glow plug. In accordance with the invention it is provided that, starting from a base value, the electric voltage increases in a time-averaged manner superproportional to the elapsed heating-up time. The invention relates also to a glow plug control unit for carrying out of such a method.

Description

[0001]The invention relates to a method for heating up of a ceramic glow plug and to a glow plug control unit for carrying out of such a method.[0002]In order to start an engine, the glow plugs must be heated up as promptly as possible to a typical operating temperature of 1000° C. to 1300° C. If during the heating up process the operating temperature is overshot, the glow plug is subjected to increased wear and, in extreme cases, it can even be damaged. In order to prevent an overshooting, it is known to gradually reduce the electric voltage applied to the glow plug during the heating-up process (MTZ 61, 200, 10).[0003]In spite of a very promising potential, ceramic glow pugs have hitherto not achieved the hoped for long service life.[0004]The object of the invention is to show a manner in which ceramic glow plugs can be heated up as rapidly as possible to their operating temperature under the least possible load so that, by the heating them up, their service life is impaired as li...

Claims

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Application Information

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IPC IPC(8): F23Q7/00F23Q7/22
CPCF02D2041/2051F02P19/022F02P19/021F02P19/00F02P19/02
Inventor KERNWEIN, MARKUSSTOCKLE, JORGTOEDTER, OLAFRUAN, GANGHUAROTTNER, MARC
Owner BERU AG DE
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